Pallet stone setting tool



1951 A. B. SINKLER ETAL PALLET STONE SETTING TOOL Filed 001:. 28, 1946 FIG.

- INVENTORS. AR HUR B. SINKLER 'EGBERT VAN HAAFTEN BY 5 7 @2 W4 ATTY.

Patented Aug. 14, 1951 PALLET STONE SETTING TOOL Arthur Brock Sinkler and Egbert Van Haaften, Lancaster, Pa., assignors to Hamilton Watch Company, Lancaster, Pa.

Application October 28, 1946, Serial No. 706,148

3 Claims. 1

This invention relates to a tool for determining the effective length of the pallet stones when mounted in the pallet.

The object of the present invention is to provide a tool by means of which the pallet stones may be correctly set in the pallet, using a gage conforming to the path of the balance wheel roller jewel and a means for measuring the distance between said gage and the point at which the pallet stones contact the escape wheel.

adiustment possible.

synthetic tion by shellac.

necessary to make but one setting.

vention.

ing in which:

Figure 1.

Figure 3 is a greatly enlarged view showing the pallet in its initial position.

Figure 4 shows the pallet in one extreme position with one side of the fork against the gage, the efi'ective length of one pallet stone being determined.

Figure 5 is a View similar to Figure 4 showing the opposite side of the fork in engagement with the gage and the effective length of the opposite stone being determined.

Pivotally mounted on the base 6 by pivot pins I I0 and l l are a pair of levers l2 and I3 which are manually operable through the raised handle portions l4 and 15. A pair of springs l6 and IT A further object of the present invention is to constantly urge the handle ends of the levers provide a tool by means of which the pallet apart. A pair of keepers I8 and I9 restrict the stones may be correctly set in the pallet without movement of the levers to within certain limits. the necessity of putting the pallet in a watch. Adjacent the operating endsof the levers are A further object of the present invention is a pair of cams 2B and 2| having kerfs to permit to provide a tool for determining the correct easy rotation. These cams are in the form of distance between the curve of the pallet fork and flat head screws having ofi center shanks so that the extreme outer edge of the pallet stones and turning will provide an adjustment of the disalso to provide means for adjusting these means tance between the edge of the cams and the within certain limits to make exceedingly fine gaging faces 22 and 23 of the gage l. A pin 24 is permanently fixed at a position substantially Pallet stones which a e generally f d o between the screw cams 2n and 2| and the operu y pp e are adjustably ating ends 25 and 26 of the levers I2 and I3. mounted in slots in the pallet and held in posi- This pin 24 serves as the pivot point for a,

It is necessary in the manufac- 25 Pallet 21. ture 0f fine watches t0 make an initial setting of A hole 28 is located beneath and extending these stones and change the setting for each beyond th fork engaging faces of th gage 1 watch. The tool forming the subject of this inand a light placed below the base permits an vention is designed to make that setting of the operator to very accurately determine when the stones under such conditions as to make it un- 30 fork of the pallet is brought into engagement with the gaging faces of the gage 1.

With the foregoing and other objects in view, A pair of pins 29 and 3B are mounted in a the invention resides in the novel arrangement block 3| and are vertically movable in the base and combination of parts and in the details of I. These pins are located directly beneath the construction hereinafter described and claimed, pallet and upon movement of a lever 32 about it being understood that changes in the precise its pivot 33 through the action of the release butembodiment of the invention herein described ton 34, the pins are pushed upward to engage the may be made within the scope of what is claimed under surface of the pallet thus very gently rewithout departing from the spirit of the inleasing it from the pivot pin 24. Springs 35 and 36 return the pins 29 and 30 to inoperative The tool is shown in the accompanying drawposition.

In operation the tool is used by placing a Figure 1 is a top plan view of the tool. pallet 21 on the pin 24, as shown in Figure 3,

Figure 2 is a cross-section on line 2-2 of with the pallet stones 31 and 38 held in the slots 39 and 40 respectively. These stones are set by hand and placed so that they are in an extended position. Movement of the lever l2 by the handle l4 brings the end 25 into engagement with the pallet at 4| pivoting the pallet about the pin 24 until one side 42 of the fork comes into engagement with the gage face 23 of the gage 1. Because of the light coming up through the hole 28, it is very easy to determine the instant of contact between the faces 42 and 23. It must be, of course, remembered that this is a very delicate operation and one which is always done by a skilled operator. At the moment of contact of the faces 42 and 23, the stone 3'! is seated in the slot 39 so that its effective length is correct. A similar operation is carried out by moving the handle I 5 of the lever 13 :bringing the face 26 into engagement with the pallet at 44 and the face of the fork 45 into engagement with the face 22 of the gage. 'In the matter above described, this seats the pallet stone 38 correctly. It is then only necessary to put a drop of hot liquid shellac in the slot 39 behind the pallet stone which effectively retains the stone in desired position.

The faces 23 and 22 of the gage I are very accurately determined and conform to the path of the surface of the balance wheel roller jewel which engages the pallet fork. By very accurately measuring and determining the distance between the face 22 and the point of engagement with the pallet stone 38 and the cam 2|, it is only necessary to make one setting of the pallet stones.

What is claimed is:

1. A pallet stone setting tool, comprising a base, a stationary gage mounted upon said base, i

said gage having a pair of pallet fork horn engaging faces, the contour of said facesconforming respectively to the line of contact of a balance wheel roller jewel with its respective pallet fork born, a stationary pin mounted on said base and serving as a pivot for the pallet, said pin being located with respect to said stationary gage so that pivotal movement of a pallet fork mounted on said pin will bring said pallet horns into engagement with their respective gage faces, a pair of adjustable cams carried by said base and located in the path of the pallet stones of said pallet fork upon movement of the pallet fork about the pivot pin and manually operated means pivotally mounted on the base and engaging the pallet directly in back of the stone slot, said manually operated means moving said pallet about said stationary pin until the horn face is brought into engagement with the gage, the pallet stone during such pivotal movement of the pallet engaging said cam and seating itself in said slot.

2. A pallet stone setting tool according to claim 1, wherein the stone engaging cams are adjustable to accurately determine the final position of the pallet stone in the slot.

3. A pallet stone setting tool, comprising a base, a stationary gage mounted upon said base, said gage having a pair of pallet fork horn engaging faces, the contour of said faces conforming respectively to the line of contact of a balance wheel roller jewel with its respective pallet fork horn, a stationary pin mounted on said base and serving as a pivot for the pallet, said pin being located with respect to said stationary gage so that pivotal movement of a pallet fork mounted on said pin will bring said pallet horns into engagement with their respective gage faces, a pair of adjustable cams carried by said base and located in the path of the pallet stones of said pallet fork upon movement of the pallet fork about the pivot pin, a pair of pivoted levers fastened to said base on either side of the pallet fork, one end of the levers adapted to engage the pallet at the rear of the pallet stone slot to rotate said pallet about the pivot, bringing the pallet stones respectively into engagement with said adjustable cams simultaneously with the engagement of the pallet horn face with the respective face of the sta tionary gage.

ARTHUR BROCK SINKLER.

EGBERT VAN I-IAAFTEN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 865,925 Miller Sept. 10, 1907 1,016,829 Hurwitz Feb. 6, 1912 1,596,126 Strutz Aug. 17, 1926 FOREIGN PATENTS Number Country Date 126;620 Switzerland July 2, 1928 

